The perimeter of a circle is equal to the square perimeter. What will be the ratio of their areas?

The curved surface area of a cylindrical pillar is 264 m² and its volume is 924 m³. Find the ratio of its diameter to its height.

The curved surface area of cylindrical pillar is and its volume is . Find the ratio of its diameter to its height.

There is a circular garden of radius 21 metres. A path of width 3.5 metres is constructed just outside the garden. What is the area (in metres) of the path? 

A right circular cone of largest volume is cut out from a solid wooden hemisphere. The remaining material is what percentage of the volume of the original hemisphere?

In a circle, difference between the circumference and radius is 37 cm. Find the area (in cm²) of the circle?

The radius of a cone is 20 cm and height is 21 cm, the total surface area of the cone is in square cm:

What is the area ( in cm² ) of the circumcircle of a triangle whose sides are 6 cm , 8 cm and 10 cm respectively ?